develop definitions of these plane figures; and
The student, using plane figures (square, rectangle, triangle, parallelogram, rhombus, and trapezoid), will
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Compare and group plane figures (circle, triangle, square, and rectangle) according to their shapes. (b)
One way to explore attributes is to investigate non-examples (e.g., a triangle could be a non-example in a sort of rectangles and circles).
Sort and classify concrete objects into appropriate subsets (categories) based on one or two attributes, such as size, shape, color, and/or thickness (e.g., sort a set of objects that are both red and thick).
Label attributes of a set of objects that has been sorted.
Name multiple ways to sort a set of objects.